RestTemplate+获取微信小程序二维码 获取微信小程序二维码获取AccessToken获取微信小程序二维码
获取微信小程序二维码 获取AccessToken public String getAccessToken(String appid, String secret) { Proxy proxy = null; if (proxyEnabled) { SocketAddress address = new InetSocketAddress(proxyHost, proxyPort); proxy = new Proxy(Proxy.Type.HTTP, address); } String url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appid + "&secret=" + secret; Map<String, Object> params = new HashMap<>(); HttpHeaders headers = new HttpHeaders(); logger.info("url:" + url); logger.info("参数" + params.toString()); ResponseEntity<String> responseEntity = httpUtil.getRequest(url, params, headers, proxy); logger.info("返回参数" + responseEntity.toString()); if (responseEntity.getStatusCode() != HttpStatus.OK) { throw new ApiException("获取【{0}】token异常HttpStatus:{1}", responseEntity.getStatusCode()); } return responseEntity.getBody(); } 获取微信小程序二维码 RestTemplate restTemplate = new RestTemplate(); Proxy proxy = null; if (proxyEnabled) { SocketAddress address = new InetSocketAddress(proxyHost, proxyPort); proxy = new Proxy(Proxy.Type.HTTP, address); } String url = "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=" + accessToken; Map<String, Object> params = new HashMap<>(); params.put("scene", scene); params.put("page", page); params.put("width", 430); HttpHeaders headers = new HttpHeaders(); logger.info("url:" + url); logger.info("参数:" + params.toString()); ResponseEntity<byte[]> responseEntity = restTemplate.postForEntity(url, params, byte[].class); if (responseEntity.getStatusCode() == HttpStatus.OK) { byte[] body = responseEntity.getBody(); InputStream inputStream = new ByteArrayInputStream(body); // 将获取流转为base64格式 String result = ""; byte[] data = null; ByteArrayOutputStream swapStream = new ByteArrayOutputStream(); byte[] buff = new byte[100]; int rc = 0; while ((rc = inputStream.read(buff, 0, 100)) > 0) { swapStream.write(buff, 0, rc); } data = swapStream.toByteArray(); result = new String(Base64.getEncoder().encode(data)); logger.info("base64:" + result); inputStream.close(); swapStream.close(); return result; } throw new ApiException("生成二维码失败"); }
开发过程中遇到的坑：
小程序返回的是buffer。开始用string去接收再把string转成byte[]数组，发现拿到的数据转成base64解析不了。用byte[]数组接收拿到的数据转成base64可以转换成图片。拿到的base64字符串找一个base64转图片的在线工具试一下即可。